Method of making installation-loops for electric fixtures



A. C. BECKER.

METHOD OF MAKING INSTALLATION LOOPS FOR ELECTRIC FIXTURES.

APPLICATION FILED JUNE29, 1920.

1,391,792, PatentedSept. 27,1921.

umreo STATES PATENT OFFICE.

ADOLPI-I C. RECKER, OF OAKVILLE, CONNECTICUT, ASSIGNOR TO THE CHASE COIL PANIES INC., OF WATERBURY, CONNECTICUT, A

CORPORATION.

Specification of Letters Patent.

Patented Sept. 27, 1921.

Application filed June 29, 1920. Serial No. 392,633.

To all whom it may concern:

Be it known that I AnoLPH C. BECKER, a citizen of the United tates, residing at Oakville, in the county of Litchfield and State of Connecticut, have invented a new and useful Improvement in Methods of Making Installation-Loops for Electric Fixtures; and I do hereby declare the following, when taken in connection with the accompanying drawings and the characters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this application, and represent, in

Figure 1, a plan view in elevation of the tubular blank.

Fig. 2, a corresponding View of the blank after a bead has been formed at equi-distant points from its respective ends.

Fig. 3, a corresponding view showing the blank as drilled.

Fig. 4, a corresponding view showing the blank as having its central portion flattened.

Fig. 5, an edge view thereof.

Fig. 6, a plan view of the blank as pierced to elongate the drilled holes.

Fig. 7, a plan view showing the blank as transversely divided to produce the two 100 s.

Fig. 8, a view of one of the completed loops partly in plan and partly in section.

Fig. 9, a View thereof in side elevation.

Heretofore installation-loops for electric fixtures have commonly been made from brass castings. On account of flaws, blowholes, and other imperfections likely to appear in the castings, such loops are expensive to finish and if defective as castings, likely to give way when heavy fixtures are suspended from them and thus cause much damage. Moreover, when cast loops are cut open to permit the insertion of the eye of another loop or the link of a chain, and then bent into their open and closed positions, they are liable to break off or at least be seriously weakened, depending, of course, upon the brittleness and character of the metal, variable in brass castings. With the end in view of avoiding the objections above enumerated, my invention consists in a method havin certain steps as will be hereinafter descri ed and pointed out in the claims.

In carrying out my invention, as herein shown, I employ a tubular wrought-metal blank which is subjected to an upsetting operation for the production of two annular heads 3 respectively spaced at equal dis tances fromthe ends of the blank. The tube 1s then drilled to form two holes 4, 4 located at equal distances from and near to the beads and between the same. The central portion of the tube is then flattened, as at 5, between and including portions of the drilled holes 4. This results in the production of two tubular wire-ways 6 lying between the heads 3 and the outer walls of the holes 4. The flattened portion 5 of the tube 1s then pierced on opposite sides of its center to form the eyes 7 of the loops, the inner ends of these eyes being formed by the drilled holes 4 whlch are intersected by the piercing of the blank. The-blank so developed is then transversely divided by the removal of the center 8 of its flattened portion 5, the shape of the section of metal thus removed depending on the contour which it is designed to give to the ends of the eyes. The nipple-ends 9 of the two loops are then externally or internally threaded, as may be desired. As shown, they are internally threaded. If preferred, the nipple ends of the loops could be threaded before dividing the blank.

Installation loops thus produced are easily finished, strong and reliable, and capable of being cut open and bent into their open and closed positions Without broken or weakened.

I claim:

1. A- method of producing wrought-metal installation-loo s for electric fixtures, consisting in forming a bead near one end of a tubular blank, then drilling the blank at a point adjacent to but separated from one edge of the said bead, then flattening the blank, so as to include that portion of the hole opposite to the head, then piercing the drilled and flattened portion of the blank so as to enlarge the opening therein, and then trimming the pierced portion of the blank and threading the portion thereof extending beyond the said head.

2. A method of producing in duplicate wrought-metal installation-loops for electric fixtures, consisting in forming beads near the respective ends of a tubular blank, then drilling the holes in the blank at points adjacent to but separated from the inner edges of the beads, then flattening the blank bedanger of being tween and including the inner portions of In testimony whereof; I have signed this the holes so drilled, then piercing the fiatspecification 1n the presence of two subscribtened portions of the blank so as to intersect ing witnesses.

and enlarge the holes therein, then dividing ADOLPH C. BECKER. the blank transversely between its pierced Witnesses: portions to separate the two loops and JOHN S. NEAGLE,

threading the nipple-ends of the said loops. W. S. Gmsrm. 

